GEOSCAN Search Results: Fastlink


TitleDeformation history and metamorphism of a synformal depression, Longstaff Bluff Formation metaturbidite, central Baffin Island, Nunavut
AuthorAllan, M M; Pattison, D R M
SourceGeological Survey of Canada, Current Research (Online) no. 2003-C15, 2003, 11 pages,
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in the following publications
File formatpdf
NTS36G/01; 36G/02
AreaBaffin Island
Lat/Long WENS-75.0000 -74.0000 69.2500 69.0000
Subjectsregional geology; structural geology; igneous and metamorphic petrology; bedrock geology; deformation; metamorphism; turbidites; structural basins; folds; foliation; petrography; pressure-temperature conditions; Longstaff Bluff Formation; Foxe Fold Belt; electron microprobe analyses; Proterozoic; Precambrian
Illustrationssketch maps; photographs
Released2003 03 14
AbstractA metamorphism-deformation history has been reconstructed for a small area of polydeformed metaturbidite of the Longstaff Bluff Formation on the northern margin of the Foxe Fold Belt, central Baffin Island. The area studied is an elongate synformal depression with main fold features related to the ca. 1.8 Ga Trans-Hudson Orogen. Pelite and semipelite contain low-pressure cordierite±andalusite assemblages. Field and microstructural relationships document four tectonic events, constrained with respect to metamorphic mineral growth events. Cordierite and prismatic andalusite growth (550-580°C, 3-3.5 kbar) postdates a weak early fabric (S1) and predates the development of a regionally penetrative, north-dipping fabric (S2) related to orogen-parallel folding (D2). Late interstitial andalusite growth (580-600°C, 3.5-4.0 kbar) postdates D2 and represents peak metamorphism. Late, locally developed crenulation cleavages
record one approximately orogen-parallel event (D3) unrelated to any regional structures and a second event (D4) that may be related to late north-trending regional crossfolding.